Finding the Fourth Proportional to 78,640.24, 108,525.60 and 42,831.76

Step by Step Solution

1. Step 1: Write the proportion equation
   78,640.24 : 108,525.60 = 42,831.76 : x
2. Step 2: Convert to fraction form
   78,640.24/108,525.60 = 42,831.76/x
3. Step 3: Cross multiply
   78,640.24x = 108,525.60 × 42,831.76
4. Step 4: Simplify right side
   78,640.24x = 4,648,342,453.06
5. Step 5: Solve for x
   x = 4,648,342,453.06/78,640.24
6. Step 6: Final answer
   x = 59,108.96